x2 items:
Mastery Energy Level +?
Greater Defense skill +51%
x3 items:
Greater Damage skill +51%
DEF +45%, if Shield item is equipped
x4 items:
Bless Buff value +65
DEF +270
HP +550
Mastery All Stat Levels +?
Mastery Base DEF +?
Mastery HP +?
Mastery Reduced DMG +?